package com.iuie.ns.frame.utils;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

public class DeviceUtil {

	/**
	 * 检查当前终端是否为移动设备
	 * @param request
	 * @return
	 */
	public static final boolean isMobile(HttpServletRequest request) {
		boolean isFromMobile = false;

		HttpSession session = request.getSession();
		// 检查是否已经记录访问方式（移动端或pc端）
		if (null == session.getAttribute("ua")) {
			try {
				// 获取ua，用来判断是否为移动端访问
				String userAgent = request.getHeader("USER-AGENT")
						.toLowerCase();
				if (null == userAgent) {
					userAgent = "";
				}
				isFromMobile = MobileCheck.check(userAgent);
				// 判断是否为移动端访问
				if (isFromMobile) {
					System.out.println("移动端访问");
					session.setAttribute("ua", "mobile");
				} else {
					System.out.println("pc端访问");
					session.setAttribute("ua", "pc");
				}
			} catch (Exception e) {
			}
		} else {
			isFromMobile = session.getAttribute("ua").equals("mobile");
		}

		return isFromMobile;
	}

	private static final class MobileCheck {

		// \b 是单词边界(连着的两个(字母字符 与 非字母字符) 之间的逻辑上的间隔),  
		// 字符串在编译时会被转码一次,所以是 "\\b"  
		// \B 是单词内部逻辑间隔(连着的两个字母字符之间的逻辑上的间隔)  
		private static final String phoneReg = "\\b(ip(hone|od)|android|opera m(ob|in)i"  
		        +"|windows (phone|ce)|blackberry"  
		        +"|s(ymbian|eries60|amsung)|p(laybook|alm|rofile/midp"  
		        +"|laystation portable)|nokia|fennec|htc[-_]"  
		        +"|mobile|up.browser|[1-4][0-9]{2}x[1-4][0-9]{2})\\b"; 
		
		private static final String tableReg = "\\b(ipad|tablet|(Nexus 7)|up.browser"  
		        +"|[1-4][0-9]{2}x[1-4][0-9]{2})\\b";  
		
		//移动设备正则匹配：手机端、平板
		private static final Pattern phonePat = Pattern.compile(phoneReg, Pattern.CASE_INSENSITIVE);  
		private static final Pattern tablePat = Pattern.compile(tableReg, Pattern.CASE_INSENSITIVE);  
		  
		/**
		 * 检测是否是移动设备访问
		 * 
		 * @Title: check
		 * @Date : 2014-7-7 下午01:29:07
		 * @param userAgent 浏览器标识
		 * @return true:移动设备接入，false:pc端接入
		 */
		private static final boolean check(String userAgent){  
		    if(null == userAgent){  
		        userAgent = "";  
		    }  
		    // 匹配  
		    Matcher matcherPhone = phonePat.matcher(userAgent);  
		    Matcher matcherTable = tablePat.matcher(userAgent);  
		    if(matcherPhone.find() || matcherTable.find()){  
		        return true;  
		    } else {  
		        return false;  
		    }  
		}
	}
}
